Measurement and Discrimination of Asymmetric Non-uniform Strain Distribution Based on Spectrum Characterization of FBG Sensors

The asymmetric deformation of glass-to-metal seals is an important defect that would lead to the failure pressure boundary in nuclear reactors. In this research, efficient approach measure and prevent potential was proposed based on spectrum characterization fiber Bragg grating (FBG) sensors. induced from small-size large-gradient nonuniform strain sealing materials; as a result, it could be monitored through spectra embedded FBGs affected by variations. theoretical analysis FBG carried out using transfer matrix model (TMM) validate measuring feasibility reliability. Based results, measured distributed experimentally. By combining reconstructed experimental proved monitored, able prevented during manufacturing process effectively via method.